The Triax system, flexible and easy to use, is a method of building a frame to support waterproof covers, allowing installers to create individual and customized designs for tensioned covers. Tension is contained within the frame, minimizing the stresses on supporting structures. Because it fits standard galvanized pipe, the new design eliminates the need for onsite welding and custom steel fabrication. Unique use of straps during onsite assembly offers flexibility in critical dimensions, eliminating frustrating complications caused by minor errors in sail measurements. The clear span, water-shedding design makes it a versatile alternative to umbrellas.